CN112859177B - Control method and system for automatic acquisition by wide-area electromagnetic method - Google Patents
Control method and system for automatic acquisition by wide-area electromagnetic method Download PDFInfo
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- CN112859177B CN112859177B CN202011630267.0A CN202011630267A CN112859177B CN 112859177 B CN112859177 B CN 112859177B CN 202011630267 A CN202011630267 A CN 202011630267A CN 112859177 B CN112859177 B CN 112859177B
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Abstract
The invention provides a control method and a system for automatic acquisition of a wide-area electromagnetic method, and relates to the technical field of electromagnetic sounding. According to the invention, the wide-area electromagnetic emission device and the wide-area electromagnetic receiving device are controlled to automatically emit and receive through the wide-area electromagnetic method automatic acquisition control parameter generation device, and exploration data is collected to complete automatic acquisition and control. The invention can be used for ground controllable source detection, does not need the intervention of professional instrument operators during field exploration, can ensure that the instrument automatically acquires controllable source time domain data required by exploration, has high acquisition efficiency and high working speed, automatically standardizes exploration constraint and greatly reduces the cost.
Description
Technical Field
The invention relates to the technical field of electromagnetic sounding, in particular to a control method and a system for automatic acquisition by a wide-area electromagnetic method.
Background
The wide-area electromagnetic method is proposed with respect to the conventional Controlled Source Audio Magnetotelluric (CSAMT) method and the MELOS method. The method inherits the advantages of using an artificial field source to overcome field source randomness by the CSAMT method and inherits the advantages of non-remote area measurement by the MELOS method; the disadvantage of weak far-zone signals of the CSAMT method is abandoned, the observation application range is expanded, meanwhile, the correction method of the MELOS method is abandoned, and the higher-order terms in the calculation formula are retained; the apparent resistivity is calculated by a formula suitable for the universe without using a Carnia formula or correcting a non-far region to a near region, so that the observation range of an artificial source electromagnetic method is greatly expanded, and the observation speed, the observation precision and the field work efficiency are improved. The wide-area electromagnetic method and the pseudo-random signal electrical method are combined to form a novel electrical prospecting method with unique characteristics.
When the existing wide-area electromagnetic prospecting system is used for field prospecting operation, a high-power wide-area electromagnetic transmitter is generally arranged to embed two AB pole plate groups to send multi-frequency pseudorandom square wave signals to the ground, an instruction is transmitted through a mobile phone or an interphone during each operation, and an operator of the wide-area electromagnetic transmitter sets frequency wave codes and frequency group codes in a pseudorandom multi-frequency wave controller according to the instruction to realize the switching and the transmission of the pseudorandom square wave signals. And then transmitting the ready transmission to wide-area electromagnetic receiver operators distributed at a plurality of measuring points through a mobile phone or an interphone, and controlling the wide-area electromagnetic receiver through a local area network by the receiver operators through operating wide-area electromagnetic receiver control software on a computer to complete one pseudorandom frequency group acquisition operation of the current station.
Therefore, the operation mode of the existing wide-area electromagnetic prospecting system needs a plurality of personnel to cooperate with the operation in a mobile phone or interphone mode, and certain specialized operation training is needed for both transmitting personnel and receiving personnel. If the transmitter is far away from the receiver, the intercom communication loss is caused, meanwhile, in an unmanned area or a mountainous area in the field, when a mobile phone signal is weak or has no signal at all, the whole wide-area electromagnetic exploration system can work normally, transmitting and receiving personnel can be informed only through a vehicle or in a hiking way and back, the waste of great manpower resources is caused, the cost is increased sharply, and the wide-area electromagnetic method in the prior art is low in working efficiency.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a control method and a control system for automatic acquisition of a wide-area electromagnetic method, which solve the technical problem of low working efficiency of the wide-area electromagnetic method in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides a control method for automatic acquisition by a wide-area electromagnetic method, which comprises the following steps:
acquiring a time node control constraint formula from a parameter information table of an exploration target;
acquiring key control time nodes in the automatic acquisition process of the wide-area electromagnetic system based on the time control constraint formula, and adding the key control time nodes into a parameter information table;
defining a communication control code and a data structure packet, and distributing the parameter information table with the key control time node to a sending end and an acquisition end of a wide-area electromagnetic method system based on the communication control code, the data structure packet and a communication mechanism algorithm;
and inputting the parameter information table with the key control time node into an automatic control core, and performing operation and processing of an automatic acquisition control algorithm to finish acquisition of exploration data.
Preferably, the obtaining of the time node control constraint formula based on the parameter information table of the exploration target includes:
calculating transmitted specific frequency wave code Fw based on parameter information table of exploration targetiAnd a frequency group coding FgiThe one-time complete acquisition task comprises n groups of sent pseudo-random signals, and a time node control constraint formula is derived according to the working principle of a wide-area electromagnetic system and the links of the control acquisition process, wherein the formula is shown as (1):
wherein:
Tnrepresenting the total time required for a complete acquisition task;
i represents the number of times;
Trdy(x) Fw representing the x-th orderiFg of frequency waveiThe transmission preparation time of the frequency group is calculated by the following formula (2):
Trdy(x)＝δt*fmin(Fw(Fg(x)))+Tsw (2)
in the formula, deltatTo transmit coefficients, TswTime is consumed for switching the circuit;
Tsnd(x) Fw of the x-th orderiFg of frequency waveiThe transmission holding time of the frequency group signal is calculated by the following formula (3), (4) and (5):
Tsnd(x)＝Ro+Rgain(x)+Rsamp(x) (3)
Rgain(x)＝θt*fmax(Fw(Fg(x)))*Wcnt (4)
Rsamp(x)＝fmin(Fw(Fg(x)))*NPeriod*Wcnt (5)
in the formula, RoFor acquisition of control core initialization time, θtTo adjust the coefficient, WcntNumber of operations, NPeriodNumber of common cycles, Rgain(x) Calculating time for the x-th automatic gain, Rsamp(x) Time spent for the x-th automatic acquisition, fmax(x) And fmin(x) Respectively extracting FwiFrequency wave FgiThe maximum and minimum frequencies in a frequency group are time consuming.
Preferably, the obtaining of the key control time node in the automatic acquisition process of the wide-area electromagnetic method system based on the time control constraint formula and the adding of the key control time node into the parameter information table include:
the total time T required by the automatic acquisition of a complete acquisition task of a key control time node in the automatic acquisition process of the wide-area electromagnetic method system can be calculated by a time control constraint formulanWherein the transmission starting time node of each sub-frequency group is Ti-1The acquisition control time node for the sending frequency group to enter the stable state is T(i-1)+Trdy(i) The time control node for completing the emission and the collection of the frequency group is TiWill Ti-1、T(i-1)+Trdy(i) And TiAdding the data into a parameter information table.
Preferably, defining a communication control code and a data structure packet, and distributing the parameter information table with the key control time node to a sending end of a wide-area electromagnetic method system and collecting the parameter information table based on the communication control code, the data structure packet and a communication mechanism algorithm, includes:
the communication operation code mainly comprises: the request control table sends a code Event _ ReqSendTbl and a reply response code Event _ AskSendTbl; the data structure packet is composed of a data structure header and an attached data stream, and the data structure header EMEP _ MSG mainly includes: message source, connection type, control code, operation code, channel code, data type, sub-packet size, total packet size and check code; the transmitting end of the wide-area electromagnetic method system sends a request for establishing communication connection to the receiving end, and after the communication connection is successfully established in response, each subsystem of the wide-area electromagnetic method system starts to transmit heartbeat packets at regular time to update system state information;
after a communication link is established, a transmitting end of the wide area electromagnetic method system creates an Event _ ReqSendTbl operation code request control table with an automatic acquisition time control node and control parameters through a data structure packet construction function, transmits a data structure body packet head EMEP _ MSG and an attached transmission data stream defined by the packet head, and distributes the attached transmission data stream to each subsystem of the wide area electromagnetic method system; after receiving the attached transmission data stream defined by the data structure packet header EMEP _ MSG and the packet header, the receiving end respectively checks the integrity and the correctness of the attached transmission data stream, and then forwards the attached transmission data stream to the message queue to sequentially analyze the data structure packet header and the transmission data stream; analyzing and responding a data structure body packet with an Event _ AskSendTbl operation code to a transmitting end of the wide-area electromagnetic method system; the parameter information table with the key control time node is directionally, completely and accurately distributed to each subsystem of the wide-area electromagnetic method system through a communication mechanism with request, response, transmission and verification.
Preferably, the step of inputting the parameter information table with the key control time node and the control parameter into an automatic control core, and performing operation and processing of an automatic acquisition control algorithm to complete acquisition of the exploration data includes:
according to the data acquisition requirement of the exploration task, the parameter information table with the key control time nodes comprises acquisition parameter information and key control time nodes, and the acquisition parameter information is input into an automatic control core to carry out operation and processing of an automatic acquisition control algorithm.
The invention also provides a control system for wide-area electromagnetic method automatic acquisition, which comprises:
the wide-area electromagnetic emission device is used for emitting multi-frequency pseudo-random square wave signals;
the wide-area electromagnetic receiving device is used for receiving the multi-frequency pseudo-random signal;
the wide-area electromagnetic method automatic acquisition control parameter generation device is used for controlling the wide-area electromagnetic emission device and the wide-area electromagnetic receiving device to automatically emit and receive based on a parameter information table of an exploration target and collecting exploration data, and specifically comprises the following steps:
acquiring a time node control constraint formula based on a parameter information table of an exploration target;
acquiring key control time nodes in the automatic acquisition process of the wide-area electromagnetic system based on the time control constraint formula, and adding the key control time nodes into a parameter information table;
defining a communication control code and a data structure packet, and distributing a parameter information table to a sending end and a collecting end of a wide-area electromagnetic method system based on the communication control code, the data structure packet and a communication mechanism algorithm;
and inputting the acquisition parameter information into an automatic control core, and performing operation and processing of an automatic acquisition control algorithm.
Preferably, the automatic control core includes: the system comprises an emission automatic control core and an acquisition automatic control core, wherein the emission automatic control core is used for controlling a wide-area electromagnetic emission device to emit multi-frequency pseudo-random square wave signals, and an acquisition automatic control center is used for a wide-area electromagnetic receiving device to receive the multi-frequency pseudo-random signals.
Preferably, the obtaining of the time node control constraint formula based on the parameter information table of the exploration target includes:
calculating transmitted specific frequency wave code Fw based on parameter information table of exploration targetiAnd a frequency group coding FgiThe one-time complete acquisition task comprises n groups of sent pseudo-random signals, and a time node control constraint formula is derived according to the working principle of a wide-area electromagnetic system and the links of the control acquisition process, wherein the formula is shown as (1):
wherein:
Tnrepresenting the total time required for a complete acquisition task;
i represents the number of times;
Trdy(x) Fw representing the x-th orderiFg of frequency waveiThe transmission preparation time of the frequency group is calculated by the following formula (2):
Trdy(x)＝δt*fmin(Fw(Fg(x)))+Tsw (2)
in the formula, deltatTo transmit coefficients, TswTime is consumed for switching the circuit;
Tsnd(x) Fw of the x-th orderiFg of frequency waveiThe transmission holding time of the frequency group signal is calculated by the following formula (3), (4) and (5):
Tsnd(x)＝Ro+Rgain(x)+Rsamp(x) (3)
Rgain(x)＝θt*fmax(Fw(Fg(x)))*Wcnt (4)
Rsamp(x)＝fmin(Fw(Fg(x)))*NPeriod*Wcnt (5)
in the formula, RoFor acquisition of control core initialization time, θtTo adjust the coefficient, WcntNumber of operations, NPeriodNumber of common cycles, Rgain(x) For the x-th time of the automatic gain calculation time,
Rsamp(x) Time spent for the x-th automatic acquisition, fmax(x) And fmin(x) Respectively extracting FwiFrequency wave FgiThe maximum and minimum frequencies in a frequency group are time consuming.
Preferably, the obtaining of the key control time node in the automatic acquisition process of the wide-area electromagnetic method system based on the time control constraint formula and the adding of the key control time node into the parameter information table include:
the total time T required by the automatic acquisition of a complete acquisition task of a key control time node in the automatic acquisition process of the wide-area electromagnetic method system can be calculated by a time control constraint formulanWherein the transmission starting time node of each sub-frequency group is Ti-1The acquisition control time node for the sending frequency group to enter the stable state is T(i-1)+Trdy(i) The time control node for completing the emission and the collection of the frequency group is TiWill Ti-1、T(i-1)+Trdy(i) And TiAdding the data into a parameter information table.
Preferably, defining a communication control code and a data structure packet, and distributing the parameter information table with the key control time node to a sending end of a wide-area electromagnetic method system and collecting the parameter information table based on the communication control code, the data structure packet and a communication mechanism algorithm, includes:
the communication operation code mainly comprises: the request control table sends a code Event _ ReqSendTbl and a reply response code Event _ AskSendTbl; the data structure packet is composed of a data structure header and an attached data stream, and the data structure header EMEP _ MSG mainly includes: message source, connection type, control code, operation code, channel code, data type, sub-packet size, total packet size and check code; the transmitting end of the wide-area electromagnetic method system sends a request for establishing communication connection to the receiving end, and after the communication connection is successfully established in response, each subsystem of the wide-area electromagnetic method system starts to transmit heartbeat packets at regular time to update system state information;
after a communication link is established, a transmitting end of the wide area electromagnetic method system creates an Event _ ReqSendTbl operation code request control table with an automatic acquisition time control node and control parameters through a data structure packet construction function, transmits a data structure body packet head EMEP _ MSG and an attached transmission data stream defined by the packet head, and distributes the attached transmission data stream to each subsystem of the wide area electromagnetic method system; after receiving the attached transmission data stream defined by the data structure packet header EMEP _ MSG and the packet header, the receiving end respectively checks the integrity and the correctness of the attached transmission data stream, and then forwards the attached transmission data stream to the message queue to sequentially analyze the data structure packet header and the transmission data stream; analyzing and responding a data structure body packet with an Event _ AskSendTbl operation code to a transmitting end of the wide-area electromagnetic method system; the parameter information table with the key control time node is directionally, completely and accurately distributed to each subsystem of the wide-area electromagnetic method system through a communication mechanism with request, response, transmission and verification.
(III) advantageous effects
The invention provides a control method and a system for automatic acquisition by a wide-area electromagnetic method. Compared with the prior art, the method has the following beneficial effects:
the control method and the system for the automatic acquisition of the wide-area electromagnetic method can be used for the detection of the ground controllable source, do not need the intervention of professional instrument operators during field exploration, can enable the instrument to automatically acquire the controllable source time domain data required by exploration, and have the advantages of high acquisition efficiency, high working speed, automatic specification of exploration constraint and substantial reduction of cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a control method for automatic acquisition by a wide-area electromagnetic method;
FIG. 2 is a block diagram of EMEP _ MSG;
fig. 3 is a control schematic diagram of wide-area electromagnetic method automatic acquisition.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a control method for automatic acquisition by a wide area electromagnetic method, solves the technical problem of low work efficiency of the wide area electromagnetic method in the prior art, realizes the work of cooperative acquisition of exploration data by an automatic acquisition system, and improves the work efficiency.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the existing wide-area electromagnetic prospecting system operation mode needs a plurality of personnel to cooperate with the operation in a mobile phone or interphone mode, and certain specialized operation training is needed for transmitting personnel and receiving personnel. If the transmitter is far away from the receiver, the intercom communication loss is caused, meanwhile, in an unmanned area or a mountainous area in the field, when a mobile phone signal is weak or has no signal at all, the whole wide-area electromagnetic prospecting system can not work normally, transmitting and receiving personnel can be notified only through a vehicle or by walking to and fro in two places, so that the great manpower resource waste is caused, the cost is increased sharply, and the operation efficiency is low. In addition, when the multi-frequency pseudorandom signal is sent or switched each time, manual operation is required to be performed by a transmitter operator and a receiver operator, so that the operation difficulty is increased, and a certain misoperation rate also exists. In particular to exploration areas with high altitude and bad terrain, such as Sichuan-Tibet plateau, and the construction difficulty and the time and labor cost are greatly increased. Therefore, a control method for wide-area electromagnetic method automatic acquisition is urgently needed for field exploration. The embodiment of the invention provides a brand-new control method for automatically acquiring a wide-area electromagnetic method, which obtains a method for calculating a key control time node by deducing a time node control constraint formula, subsequently defines a set of communication control codes and a data structure packet, correctly and completely distributes parameter information of the automatic acquisition control method with the key control time node to a control core of the wide-area electromagnetic method system through a communication mechanism algorithm with request, response, transmission and verification, and finally designs an automatic acquisition control algorithm running in the automatic control core according to the acquisition data requirement of an exploration task to finish the work of cooperatively acquiring exploration data of the automatic acquisition system. The method can realize automatic acquisition of field exploration in exploration areas with high altitude, severe relief and bad terrain, and can obtain high-precision and accurate exploration acquisition data without the intervention of professional operators.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The embodiment of the invention provides a control method for automatic acquisition by a wide-area electromagnetic method, which comprises the following steps of S1-S4:
s1, acquiring a time node control constraint formula from a parameter information table of the exploration target;
s2, acquiring key control time nodes in the automatic acquisition process of the wide-area electromagnetic method system based on the time control constraint formula, and adding the key control time nodes into a parameter information table;
s3, defining a communication control code and a data structure packet, and distributing a parameter information table with a key control time node to a sending end and a collecting end of the wide-area electromagnetic method system based on the communication control code, the data structure packet and a communication mechanism algorithm;
and S4, inputting the parameter information table with the key control time node into the automatic control core, and performing operation and processing of an automatic acquisition control algorithm to finish acquisition of exploration data.
The control method for the automatic acquisition of the wide-area electromagnetic method can be used for ground controllable source detection, does not need the intervention of professional instrument operators during field exploration, can enable the instrument to automatically acquire controllable source time domain data required by exploration, and has the advantages of high acquisition efficiency, high working speed, automatic specification of exploration constraint and substantial reduction of cost.
The following describes each step in detail:
in step S1, a time node control constraint formula is obtained based on the parameter information table of the exploration target, and the specific implementation process is as follows:
calculating transmitted specific frequency wave code Fw based on parameter information table of exploration targetiAnd a frequency group coding FgiThe one-time complete acquisition task comprises n groups of sent pseudo-random signals, and a time node control constraint formula is derived according to the working principle of a wide-area electromagnetic system and the links of the control acquisition process, wherein the formula is shown as (1):
wherein:
Tnrepresenting the total time required for a complete acquisition task;
i represents the number of times;
Trdy(x) Fw representing the x-th orderiFg of frequency waveiThe transmission preparation time of the frequency group is calculated by the following formula (2):
Trdy(x)＝δt*fmin(Fw(Fg(x)))+Tsw (2)
in the formula, deltatTo transmit coefficients, TswTime is consumed for switching the circuit;
Tsnd(x) Fw of the x-th orderiFg of frequency waveiThe transmission holding time of the frequency group signal is calculated by the following formula (3), (4) and (5):
Tsnd(x)＝Ro+Rgain(x)+Rsamp(x) (3)
Rgain(x)＝θt*fmax(Fw(Fg(x)))*Wcnt (4)
Rsamp(x)＝fmin(Fw(Fg(x)))*NPeriod*Wcnt (5)
in the formula, RoFor acquisition of control core initialization time, θtTo adjust the coefficient, WcntNumber of operations, NPeriodNumber of common cycles, Rgain(x) Calculating time for the x-th automatic gain, Rsamp(x) Time spent for the x-th automatic acquisition, fmax(x) And fmin(x) Respectively extracting FwiFrequency wave FgiThe maximum and minimum frequencies in a frequency group are time consuming.
In step S2, a key control time node in the automatic acquisition process of the wide-area electromagnetic system is obtained based on the time control constraint formula, and the key control time node is added to the parameter information table. The specific implementation process is as follows:
the total time T required by the automatic acquisition of a complete acquisition task of a key control time node in the automatic acquisition process of the wide-area electromagnetic method system can be calculated by a time control constraint formulanWherein the transmission starting time node of each sub-frequency group is Ti-1The acquisition control time node for the sending frequency group to enter the stable state is T(i-1)+Trdy(i) The time control node for completing the emission and the collection of the frequency group is Ti. Will Ti-1、T(i-1)+Trdy(i) And TiAdding the data into a parameter information table.
In step S3, a communication control code and a data structure packet are defined, and based on the communication control code, the data structure packet and a communication mechanism algorithm, a parameter information table with a key control time node is distributed to a sending end and a collecting end of the wide-area electromagnetic method system. The specific implementation process is as follows:
the communication operation code mainly comprises: the request control table transmits a code Event _ ReqSendTbl and a reply response code Event _ ask sendtbl. The data structure packet is composed of a data structure header and an attached data stream, and the data structure header EMEP _ MSG mainly includes: the structure of the message source, connection type, control code, operation code, channel code, data type, packet size, total packet size, check code, EMEP _ MSG is shown in fig. 2. And the transmitting terminal of the wide-area electromagnetic method system sends a request for establishing communication connection to the receiving terminal, and after the communication connection is successfully established in response, each subsystem of the wide-area electromagnetic method system starts to transmit heartbeat packets at regular time to update the state information of the system.
After a communication link is established, a transmitting end of the wide area electromagnetic method system creates an Event _ ReqSendTbl operation code request control table with an automatic acquisition time control node and control parameters through a data structure packet construction function, transmits a data structure body packet head EMEP _ MSG and an attached transmission data stream defined by the packet head, and distributes the attached transmission data stream to each subsystem of the wide area electromagnetic method system; after receiving the attached transmission data stream defined by the data structure packet header EMEP _ MSG and the packet header, the receiving end respectively checks the integrity and the correctness of the attached transmission data stream, and then forwards the attached transmission data stream to the message queue to sequentially analyze the data structure packet header and the transmission data stream; analyzing and responding a data structure body packet with an Event _ AskSendTbl operation code to a transmitting end of the wide-area electromagnetic method system; the parameter information table with the key control time node is directionally, completely and accurately distributed to each subsystem of the wide-area electromagnetic method system through a communication mechanism with request, response, transmission and verification.
In step S4, the parameter information table with the key control time node and the control parameters are input to the automatic control core, and the operation and processing of the automatic acquisition control algorithm are performed to complete the acquisition of the exploration data. The specific implementation process is as follows:
according to the data acquisition requirement of the exploration task, the parameter information table with the key control time nodes can be obtained through the steps S1-S3, the parameter information table with the key control time nodes comprises acquisition parameter information and key control time nodes, the acquisition parameter information is input into an automatic control core (the automatic control core comprises an acquisition automatic control core and a transmission automatic control core), and the operation and processing of an automatic acquisition control algorithm are carried out. Firstly, initializing an acquisition automatic control core to enable the acquisition automatic control core to enter a processing state; acquiring the total number N of acquisition parameter informationcntChecking each piece of information ID1To
If not, entering further processing. Entry ID using a polling mechanism to establish a loopiTreatment from NcntGet ID iniTo check the current IDiWhether the entry is complete; accumulating entry count ID if donei+1And jumps to the next entry IDi+1Processing, otherwise, continuing to check IDiWhether the project name and the task name in the entry are consistent with the transmitting terminal information of the current wide-area electromagnetic method system or not; accumulating entry count ID if donei+1And jumps to the next entry IDi+1Processing, otherwise checking IDiThe working method identification in the item; if the mode IS a non-automatic acquisition mode (such as CS, IS, WFEM and the like), calculating storage address and coordinate information and entering single-mode sampling; if the mode is an automatic acquisition mode (AWFEM), after the control core obtains the synchronous signal, a temporary item linked list is established
And accumulating the total number of entries McntUntil the total number N of the parameter information is acquiredcntIs polled. Next based on the item linked list
And total number McntEntering an AWFEM working mode, acquiring system synchronous state information and confirming to enter a synchronous working state; the item linked list can be obtained according to the total time formula in the above step S1
Total time of
Let total time of day be TdayCalculating the number of cycles of the day cycle
The second count calculation of the current time taken by the synchronization system is currently in the fourth cycle, i.e.
Controlling the time node according to the transmission in the above step S2
Acquisition control time node
And the number of seconds that the current cycle period has elapsed
The next linked list to be automatically collected and controlled can be obtained
Specific item i ofsp(ii) a If ispEqual to 0, the termination entry is identified as ESAssigned a value of McntOtherwise, it is marked as isp(ii) a Then get the ithspAll control information of the entry, when checking its completion flag as incomplete, allocates a time domain numberObtaining coordinate information according to the storage address and the space and updating the coordinate information into the control parameters; next, the time of the day second information of the synchronous system is monitored, and time nodes are controlled according to the acquisition
Calculating the number of acquisition waiting seconds, and entering after the acquisition time arrives
Collecting; setting a channel used for collection and an AD sampling rate, carrying out gain self-adaptive calculation, then setting the number of sampling data, a sampling identifier and a synchronous identifier of boundary alignment, starting an interrupted collection function, caching the collected data into 64 eMMC blocks after the collected data enters each channel cache region, and continuously writing the data into a storage body until the data is cached into 64 eMMC blocks until the data is cached into the storage body
Finishing data acquisition, updating the size of the acquired channel data into the control parameters, and continuing to enter the step ispIn the next entry of (1), by
And termination entry identification ESJudging until the whole item linked list is completed
Collecting work of (1); and finally writing the updated control parameters into the parameter storage area.
In the actual operation process, the specific method of the control method for the wide-area electromagnetic method automatic acquisition is as follows:
(1) designing working parameters: and according to the exploration target, obtaining coordinate information of target measuring lines and measuring points, and designing a proper frequency wave and frequency group combination for transmitting the pseudo-random signals. And calculating key control nodes in the automatic acquisition process of the wide-area electromagnetic method system according to a time node control constraint formula.
(2) And (3) control parameter distribution: and establishing an automatic acquisition time control node and control parameters through an EMEP _ MSG data structure packet construction function, and correctly and completely distributing the parameter information of the automatic acquisition control method with the key time node to a wide-area electromagnetic method system control core through a communication mechanism algorithm with request, response, transmission and verification.
(3) And controlling the processing core to run an automatic acquisition control algorithm. And (4) after the wide-area electromagnetic method system obtains the acquisition parameter information with the automatic acquisition time control node and the control parameter, inputting the acquisition parameter information into a control processing core, carrying out operation and processing of an automatic acquisition control algorithm, and obtaining the acquisition data information of the exploration area after processing by the method of the step S4.
An embodiment of the present invention further provides a control system for wide-area electromagnetic method automatic acquisition, as shown in fig. 3, the system includes: the wide-area electromagnetic emission device, the wide-area electromagnetic receiving device and the wide-area electromagnetic method automatic acquisition control parameter generation device.
Wherein:
the wide-area electromagnetic transmitting device is used for transmitting multi-frequency pseudo-random square wave signals and comprises a wide-area high-power transmitter, a pseudo-random signal controller and the like. The wide-area electromagnetic receiving device is used for receiving the multi-frequency pseudorandom signals, and both the wide-area electromagnetic transmitting device and the wide-area electromagnetic receiving device are the prior art and are not described herein again.
The wide-area electromagnetic method automatic acquisition control parameter generation device is used for controlling the wide-area electromagnetic emission device and the wide-area electromagnetic receiving device to automatically emit and receive based on a parameter information table of an exploration target and collecting exploration data. The specific operation is as follows:
acquiring a time node control constraint formula based on a parameter information table of an exploration target;
acquiring key control time nodes in the automatic acquisition process of the wide-area electromagnetic system based on the time control constraint formula, and adding the key control time nodes into a parameter information table;
defining a communication control code and a data structure packet, and distributing a parameter information table with key control time nodes to a sending end and an acquisition end of a wide-area electromagnetic method system based on the communication control code, the data structure packet and a communication mechanism algorithm;
and inputting the acquisition parameter information into an automatic control core, and performing operation and processing of an automatic acquisition control algorithm.
The automatic control core comprises an automatic emission control core and an automatic acquisition control core, wherein the automatic emission control core is used for controlling a wide-area electromagnetic emission device (an emission end in a corresponding method) to emit multi-frequency pseudo-random square wave signals, and the automatic acquisition control core is used for a wide-area electromagnetic receiving device (a receiving end in a corresponding method) to receive the multi-frequency pseudo-random signals.
It can be understood that the task scheduling system of the control system for automatic acquisition by the wide-area electromagnetic method provided in the embodiment of the present invention corresponds to the task scheduling method of the control system for automatic acquisition by the wide-area electromagnetic method, and the explanation, the example, the verification, and other related contents thereof may refer to corresponding contents in the task scheduling method of the control system for automatic acquisition by the wide-area electromagnetic method, and are not described herein again.
In summary, compared with the prior art, the method has the following beneficial effects:
1. the embodiment of the invention realizes the automatic acquisition and exploration work of the wide-area electromagnetic method system, so that the field exploration can be completed without the intervention of professional instrument operators through automatic control, and compared with the traditional method, the method is simpler and more intelligent, and has high acquisition efficiency and high working speed.
2. By using the method of the embodiment of the invention, the method can play a prominent role particularly in the local harsh environment which cannot be adapted by professional technicians in areas with high altitude and severe terrain conditions, such as the Sichuan-Tibet plateau and the like, and can simply engage local residents to complete exploration by using the control technology of the wide-area electromagnetic system for automatic acquisition. A professional technician can perform intelligent exploration operation by the method of the embodiment of the invention only by completing automatic acquisition and basic parameter constraint design at a site.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A control method for automatic acquisition by a wide-area electromagnetic method is characterized by comprising the following steps:
acquiring a time node control constraint formula based on a parameter information table of an exploration target;
acquiring key control time nodes in the automatic acquisition process of the wide-area electromagnetic system based on the time control constraint formula, and adding the key control time nodes into a parameter information table;
defining a communication control code and a data structure packet, and distributing the parameter information table with the key control time node to a sending end and an acquisition end of a wide-area electromagnetic method system based on the communication control code, the data structure packet and a communication mechanism algorithm;
inputting the parameter information table with the key control time node into an automatic control core, and performing operation and processing of an automatic acquisition control algorithm to finish acquisition of exploration data; the method for acquiring the time node control constraint formula based on the parameter information table of the exploration target comprises the following steps:
calculating transmitted specific frequency wave code Fw based on parameter information table of exploration targetiAnd a frequency group coding FgiThe one-time complete acquisition task comprises n groups of sent pseudo-random signals, and a time node control constraint formula is derived according to the working principle of a wide-area electromagnetic system and the links of the control acquisition process, wherein the formula is shown as (1):
wherein:
Tnrepresenting the total time required for a complete acquisition task;
i represents the number of times;
Trdy(x) Fw representing the x-th orderiFg of frequency waveiThe transmission preparation time of the frequency group is calculated by the following formula (2):
Trdy(x)＝δt*fmin(Fw(Fg(x)))+Tsw (2)
in the formula, deltatTo transmit coefficients, TswTime is consumed for switching the circuit;
Tsnd(x) Fw of the x-th orderiFg of frequency waveiThe transmission holding time of the frequency group signal is calculated by the following formula (3), (4) and (5):
Tsnd(x)＝Ro+Rgain(x)+Rsamp(x) (3)
Rgain(x)＝θt*fmax(Fw(Fg(x)))*Wcnt (4)
Rsamp(x)＝fmin(Fw(Fg(x)))*NPeriod*Wcnt (5)
in the formula, RoFor acquisition of control core initialization time, θtTo adjust the coefficient, WcntNumber of operations, NPeriodNumber of common cycles, Rgain(x) Is composed ofTime of autogain calculation, R, of xsamp(x) Time spent for the x-th automatic acquisition, fmax(x) And fmin(x) Respectively extracting FwiFrequency wave FgiThe maximum and minimum frequencies in a frequency group are time consuming.
2. The method for controlling automatic collection of the wide-area electromagnetic method according to claim 1, wherein the obtaining of the key control time node in the automatic collection process of the wide-area electromagnetic method system based on the time control constraint formula and the adding of the key control time node to the parameter information table include:
the total time T required by the automatic acquisition of a complete acquisition task of a key control time node in the automatic acquisition process of the wide-area electromagnetic method system can be calculated by a time control constraint formulanWherein the transmission starting time node of each sub-frequency group is Ti-1The acquisition control time node for the sending frequency group to enter the stable state is T(i-1)+Trdy(i) The time control node for completing the emission and the collection of the frequency group is TiWill Ti-1、T(i-1)+Trdy(i) And TiAdding the data into a parameter information table.
3. The method for controlling automatic collection of wide-area electromagnetic method according to claim 1, wherein defining communication control codes and data structure packets, and distributing the parameter information table with the key control time node to a sending end of the wide-area electromagnetic method system and collecting based on the communication control codes, the data structure packets and a communication mechanism algorithm comprises:
the communication operation code mainly comprises: the request control table sends a code Event _ ReqSendTbl and a reply response code Event _ AskSendTbl; the data structure packet is composed of a data structure header and an attached data stream, and the data structure header EMEP _ MSG mainly includes: message source, connection type, control code, operation code, channel code, data type, sub-packet size, total packet size and check code; the transmitting end of the wide-area electromagnetic method system sends a request for establishing communication connection to the receiving end, and after the communication connection is successfully established in response, each subsystem of the wide-area electromagnetic method system starts to transmit heartbeat packets at regular time to update system state information;
after a communication link is established, a transmitting end of the wide area electromagnetic method system creates an Event _ ReqSendTbl operation code request control table with an automatic acquisition time control node and control parameters through a data structure packet construction function, transmits a data structure body packet head EMEP _ MSG and an attached transmission data stream defined by the packet head, and distributes the attached transmission data stream to each subsystem of the wide area electromagnetic method system; after receiving the attached transmission data stream defined by the data structure packet header EMEP _ MSG and the packet header, the receiving end respectively checks the integrity and the correctness of the attached transmission data stream, and then forwards the attached transmission data stream to the message queue to sequentially analyze the data structure packet header and the transmission data stream; analyzing and responding a data structure body packet with an Event _ AskSendTbl operation code to a transmitting end of the wide-area electromagnetic method system; the parameter information table with the key control time node is directionally, completely and accurately distributed to each subsystem of the wide-area electromagnetic method system through a communication mechanism with request, response, transmission and verification.
4. The method for controlling automatic collection of wide-area electromagnetic method according to claim 1, wherein said inputting said parameter information table with key control time node and control parameter to automatic control core for performing operation and processing of automatic collection control algorithm to complete collection of exploration data comprises:
according to the data acquisition requirement of the exploration task, the parameter information table with the key control time nodes comprises acquisition parameter information and key control time nodes, the acquisition parameter information is input into an automatic control core, and the operation and processing of an automatic acquisition control algorithm are carried out.
5. A control system for wide-area electromagnetic method automatic acquisition is characterized by comprising:
the wide-area electromagnetic emission device is used for emitting multi-frequency pseudo-random square wave signals;
the wide-area electromagnetic receiving device is used for receiving the multi-frequency pseudo-random signal;
the wide-area electromagnetic method automatic acquisition control parameter generation device is used for controlling the wide-area electromagnetic emission device and the wide-area electromagnetic receiving device to automatically emit and receive based on a parameter information table of an exploration target and collecting exploration data, and specifically comprises the following steps:
acquiring a time node control constraint formula based on a parameter information table of an exploration target;
acquiring key control time nodes in the automatic acquisition process of the wide-area electromagnetic system based on the time control constraint formula, and adding the key control time nodes into a parameter information table;
defining a communication control code and a data structure packet, and distributing a parameter information table to a sending end and a collecting end of a wide-area electromagnetic method system based on the communication control code, the data structure packet and a communication mechanism algorithm;
inputting the acquisition parameter information into an automatic control core, and performing operation and processing of an automatic acquisition control algorithm;
the method for acquiring the time node control constraint formula based on the parameter information table of the exploration target comprises the following steps:
calculating transmitted specific frequency wave code Fw based on parameter information table of exploration targetiAnd a frequency group coding FgiThe one-time complete acquisition task comprises n groups of sent pseudo-random signals, and a time node control constraint formula is derived according to the working principle of a wide-area electromagnetic system and the links of the control acquisition process, wherein the formula is shown as (1):
wherein:
Tnrepresenting the total time required for a complete acquisition task;
i represents the number of times;
Trdy(x) Fw representing the x-th orderiFg of frequency waveiThe transmission preparation time of the frequency group is calculated by the following formula (2):
Trdy(x)＝δt*fmin(Fw(Fg(x)))+Tsw (2)
in the formula, deltatTo transmit coefficients, TswTime is consumed for switching the circuit;
Tsnd(x) Fw of the x-th orderiFg of frequency waveiThe transmission holding time of the frequency group signal is calculated by the following formula (3), (4) and (5):
Tsnd(x)＝Ro+Rgain(x)+Rsamp(x) (3)
Rgain(x)＝θt*fmax(Fw(Fg(x)))*Wcnt (4)
Rsamp(x)＝fmin(Fw(Fg(x)))*NPeriod*Wcnt (5)
in the formula, RoFor acquisition of control core initialization time, θtTo adjust the coefficient, WcntNumber of operations, NPeriodNumber of common cycles, Rgain(x) Calculating time for the x-th automatic gain, Rsamp(x) Time spent for the x-th automatic acquisition, fmax(x) And fmin(x) Respectively extracting FwiFrequency wave FgiThe maximum and minimum frequencies in a frequency group are time consuming.
6. The wide-area electromagnetic method automatic acquisition control system of claim 5, wherein the automatic control core comprises: the system comprises an emission automatic control core and an acquisition automatic control core, wherein the emission automatic control core is used for controlling a wide-area electromagnetic emission device to emit multi-frequency pseudo-random square wave signals, and an acquisition automatic control center is used for a wide-area electromagnetic receiving device to receive the multi-frequency pseudo-random signals.
7. The wide-area electromagnetic method automatic acquisition control system according to claim 5, wherein the obtaining of the key control time node in the wide-area electromagnetic method system automatic acquisition process based on the time control constraint formula, and the adding of the key control time node to the parameter information table comprises:
the key control time node in the automatic acquisition process of the wide-area electromagnetic system can be calculated by a time control constraint formula, and the key control time node is automatically acquired onceTotal time T required for a complete acquisition tasknWherein the transmission starting time node of each sub-frequency group is Ti-1The acquisition control time node for the sending frequency group to enter the stable state is T(i-1)+Trdy(i) The time control node for completing the emission and the collection of the frequency group is TiWill Ti-1、T(i-1)+Trdy(i) And TiAdding the data into a parameter information table.
8. The wide-area electromagnetic method automatic acquisition control system according to claim 5, wherein communication control codes and data structure packets are defined, and the parameter information table with the key control time nodes is distributed to a wide-area electromagnetic method system sending end and acquisition based on the communication control codes, the data structure packets and a communication mechanism algorithm, and the method comprises the following steps:
the communication operation code mainly comprises: the request control table sends a code Event _ ReqSendTbl and a reply response code Event _ AskSendTbl; the data structure packet is composed of a data structure header and an attached data stream, and the data structure header EMEP _ MSG mainly includes: message source, connection type, control code, operation code, channel code, data type, sub-packet size, total packet size and check code; the transmitting end of the wide-area electromagnetic method system sends a request for establishing communication connection to the receiving end, and after the communication connection is successfully established in response, each subsystem of the wide-area electromagnetic method system starts to transmit heartbeat packets at regular time to update system state information;
after a communication link is established, a transmitting end of the wide area electromagnetic method system creates an Event _ ReqSendTbl operation code request control table with an automatic acquisition time control node and control parameters through a data structure packet construction function, transmits a data structure body packet head EMEP _ MSG and an attached transmission data stream defined by the packet head, and distributes the attached transmission data stream to each subsystem of the wide area electromagnetic method system; after receiving the attached transmission data stream defined by the data structure packet header EMEP _ MSG and the packet header, the receiving end respectively checks the integrity and the correctness of the attached transmission data stream, and then forwards the attached transmission data stream to the message queue to sequentially analyze the data structure packet header and the transmission data stream; analyzing and responding a data structure body packet with an Event _ AskSendTbl operation code to a transmitting end of the wide-area electromagnetic method system; the parameter information table with the key control time node is directionally, completely and accurately distributed to each subsystem of the wide-area electromagnetic method system through a communication mechanism with request, response, transmission and verification.
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